JP3531434B2 - Recording and playback system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing video, audio and computer data on a recording medium such as a magnetic tape.

[0002]

2. Description of the Related Art Currently, there is MPEG2-TS (Transport Stream) as a method for transmitting multimedia information including video and audio. This is MPE for audio and video
The signal encoded by the G2 encoding method is fixed to 1
This is a method of transmitting by dividing it into packets called 88-byte transport packets.

This transport packet is called IEEE
When transmitting a digital interface standardized as 1394 as a transmission path, the following procedure is performed.

First, FIG. 4 shows an operation in the case of outputting data from a signal source such as an MPEG2 broadcast receiver to a transmission path. Hereafter, items with the same number have the same configuration and function.

In FIG. 4, each transport packet is input from the signal source 42 to the transmitting means. IE is the means of transmission
CTR (cycle time register) that holds the count value of 24.576 MHz of EE1394 transmission line clock
Is used to generate a transmission time stamp detected by the timing extraction means 43 and corresponding to the input timing of each packet. Since this transmission time stamp actually defines the timing at which the receiving means of the receiving device outputs the signal to the inside of the device, the buffer of the transmitting means of the signal source with respect to the CTR value of the input timing of each packet. Is generated by adding an offset value such as a delay due to the above, a delay of a transmission path, a delay due to a buffer of a receiving means of a receiving device. The transmission time stamp adding means 44 adds 4 bytes including the transmission time stamp to 188 bytes of each transport packet to form a 192 byte source packet as shown in FIG. This source packet is divided by packet division or CIP header adding means or a plurality of source packets are collected according to the transmission band in the transmission path.

Packets that are divided or a plurality of packets are divided into isochronous (Iso) packets that retain the real-time property of data in the video and audio signals of IEEE 1394.
A CIP header, which is a header for transmission in chronous communication, and a header for 1394 transmission are added to form a packet called a data packet, which is output to the transmission path.

In order to receive and record / reproduce the above data, restoration of the packet output timing during reproduction becomes a problem.

In the MPEG2 transport stream standard, the operation clock of the decoder is restored by using the arrival timing of each packet, so that the strictness that the jitter is within + -30 ppm is required for the arrival timing of the packet.

FIG. 6 shows the operation of the conventional recording / reproducing apparatus.
6, in the recording / reproducing apparatus 61, the receiving means 62 first looks at the 1394 header and the CIP header from the received data packet, and selects and receives the packet to be received. At this time, the channel number, the transmission destination of the data, the type of the data, etc. being transmitted can be identified using the header. 1
394 header deletion / addition means 63, CIP header deletion /
The addition / packet concatenation means 64 restores the source packet by removing the 1394 header and CIP header of the received packet.

At this time, error processing and the like are also performed at the same time.
Next, the output timing detecting means 66 causes the receiving means C
The TR value and the transmission time stamp of each source packet are compared, and when they match, the transmission time stamp removing / adding means 67 from the buffer 65 of the receiving means is a transport packet 188 which is the data portion of each source packet.
The byte is output to the recording / reproducing processing unit 73.

The recording / reproducing processing means 73 performs recording processing on the received transport packet and records it on a recording medium. At this time, timing information called a recording time stamp is added to the transport packet by the recording time stamp adding / deleting means 71 so that the timing at the time of recording at the time of reproduction, more strictly, the transmission time interval of each packet can be held. To record.

This timing information is generated based on the operation clock 27 MHz of the recording means. Further, if the operation clock 27 MHz itself is different from the operation clock of the signal source, the buffer overflows or underflow occurs during long-time recording and correct recording cannot be performed. Therefore, the operation clock of the recording / reproducing apparatus is set to the signal source. It is necessary to match the operation clock of. For this purpose, the PCR detection means 68 including a transport decoder analyzes the contents of each transport packet, and the PCR (Program Clock Re) contained therein is analyzed.
27 MHz using PLL69 from the (fence) value
Perform clock recovery.

At the time of reproduction, the recording / reproduction processing means 73 performs processes such as demodulation and error correction, and then restores the transport packet. The timing extraction unit 70 compares the recording time stamp added to the restored transport packet with the count value of the operation clock of the recording / reproducing apparatus, and outputs it from the buffer 72 to the transmission / reception unit 62 at the coincident timing. As a result, the time interval of each packet that is deviated due to recording and reproduction becomes the same as that before recording.

The processing such as the addition of the transmission time stamp in the transmitting / receiving means 62 of the recording / reproducing apparatus is the same as the processing in the transmitting means of the signal source described above. As a result, the receiving device of the decoder, which receives the transmission data from the recording / reproducing means, can transmit the data at the same time interval as the data from the original signal source to the decoding means, and the decoding can be performed without a problem such as overflow or underflow. You can display images.

FIG. 7 shows the operation of the decoder. In FIG. 7, in the decoder 81, the receiving means 82 first looks at the 1394 header and the CIP header from the received data packet, and selects the packet to be received and receives it. The 1394 header deleting / adding unit 83, the CIP header deleting / adding unit, and the packet concatenating unit 84 139 the received packet.
The source packet is restored by removing the 4 header and the CIP header.

At this time, error processing and the like are also performed at the same time.
Next, the output timing detecting means 86 causes the receiving means C
The TR value and the transmission time stamp of each source packet are compared, and when they match, the transmission time stamp removing / adding means 87 from the buffer 85 of the receiving means is the transport packet 188 which is the data portion of each source packet.
Byte TS (Transport Stream) decoder 8
Output to 8.

The TS decoder 88 decodes the received transport packet to separate the video data and audio data, and the audio decoder 90 video decoder 89 decodes and outputs it. If the operation clock 27 MHz itself of this decoder is different from the operation clock of the signal source, the buffer overflow or underflow will occur during long-time recording and correct recording will not be possible. It is necessary to match the operation clock of. For this purpose, the PCR detection means 91 analyzes the contents of each transport packet, and the PCR (Program Clock Ref) contained therein is analyzed.
27 MHz clock recovery using the PLL 92 is performed from the erasure value.

[0018]

As described above, M
Restoration of packet output timing becomes a problem in PEG2-TS transmission and recording / reproduction. In order to solve this, in the conventional recording / reproducing apparatus, it was necessary to restore the output timing by detecting the transmission time stamp, analyze the transport packet header and restore the 27 MHz clock by PCR, generate the recording time stamp, and add.

However, the above-mentioned structure has a drawback that the device scale becomes large for transmission and recording / reproduction. In particular, MPEG header analysis requires simple decoding, which increases the device scale. This has the original purpose of reducing the device scale by not having the decoding means for the recording / reproducing apparatus which does not have the MPEG decoding means in the main body as shown in the previous example and the decoding is performed by the external decoder. It's also a loss.

The present invention aims to solve the above problems, and
In EG2 broadcast recording, it is possible to restore the packet output timing at the time of reproduction by minimizing the additional circuit, and particularly to record the data of the MPEG2 transport stream format by utilizing the existing digital VTR format. It is a thing.

[0021]

In order to solve this problem, the first means of the present invention is to use a timer for transmitting packets.
Buffer that absorbs the difference in timing between recording and playback
It has a §, receives digital data transmitted through the transmission path recorded on a recording medium, a recording and reproducing apparatus for transmitting and reproducing digital data recorded on said recording medium to said transmission path, packet Timing and decoding section
Has a buffer that absorbs the difference in the timing of sending to
Receives the digital data transmitted from the recording / reproducing device.
A recording / reproducing system comprising a decoding device for receiving and decoding , wherein when each packet constituting the digital data is transmitted through the transmission path, a signal source to a transmission means connected to the transmission path. Generated based on the timing at which each packet is output ,
State packet or a transmission time stamp is information that is added to a part of the packet, was added to the each packet
Digital data of the recording medium in the recording / reproducing apparatus.
The recorded digital data is recorded on the body and played back.
Data from the recording medium,
From the recording medium with a packet added to each packet
Timing recovery of read digital data during playback
Transmission to the transmission path without performing
Receive the digital data sent on the transmission path,
Transmission data added to each packet that makes up digital data
Each packet based on the time stamp of the decoding device.
The tie to be output from the buffer, which is one of the components
The recording / reproducing system is characterized in that the ming is determined .

Specifically, MPEG transmission IEEE139
Transmission time stamp (SP
H: Source Packet Header 4 bytes, content is IEEE 1394 CTR (24.576M
Hz count value as the recording and reproducing apparatus serial <br/> was recorded in Oite recording medium without separating the timestamp 25 bits)) by the time of reproduction is <br/> output without timing recovery at a free running clock, the timing Restoration is transmitted from the recording / playback device
IEEE of decoding device for receiving and decoding digital data
E1394 is performed based on the MPEG transmission IEEE 1394 protocol.

As a result, it is necessary to restore the output timing by detecting the SPH and MP, which are required in the conventional recording / reproducing apparatus.
EG2-TS decoding, PCR (Program Cl
It is not necessary to recover the 27 MHz clock, generate the recording time stamp, add, etc. by the ock Reference).

The second means of the present invention is to send packets
The difference between the transmission timing and the recording / playback timing
It has an absorption buffer, and recorded on a recording medium by receiving the digital data transmitted through the transmission path, the recording
A recording / reproducing device for reproducing the digital data recorded on the medium and transmitting it to the transmission path, and a type for receiving a packet.
The buffer that absorbs the difference between the
And a digital signal transmitted from the recording / reproducing apparatus.
Recording consisting of a decoding device for receiving and decoding digital data
In the reproducing system , the type of the digital data is discriminated, and the digital data is MPEG2-TS.
In the case where the transmission time stamp is added to each packet forming the digital data ,
If the digital data is other than MPEG2-TS, the above
For each packet that makes up digital data, the transmission type
While not adding stamp, and recorded on the recording medium in the recording and reproducing apparatus together with information for indicating whether or not adding the transmission time stamp
However, the transmission time stamp is added during playback.
Based on the information indicating whether or not
If the transmission time stamp is added, the transmission time stamp is
Use as it is as a transmission time stamp,
If the transmission time stamp is not added, the
The transmission time stamp is generated based on the
Each part of the digital data reproduced from the recording medium
Packet or part of the packet, and add the record
Send from the playback device to the decoding device via the transmission path
A recording and reproducing system, characterized in that that.

Since some data to be transmitted or recorded / reproduced does not require exact restoration of timing, the use of the present invention may or may not require exact restoration of timing. Both cases can be dealt with.

Further, the third means of the present invention is to transmit a packet
The difference between the transmission timing and the recording / playback timing
It has an absorption buffer, and recorded on a recording medium by receiving the digital data transmitted through the transmission path, the recording
A recording / reproducing device for reproducing the digital data recorded on the medium and transmitting it to the transmission path, and a type for receiving a packet.
The buffer that absorbs the difference between the
And a digital signal transmitted from the recording / reproducing apparatus.
Recording consisting of a decoding device for receiving and decoding digital data
The playback system uses a transmission time stamp for each packet.
The digital data of the state appended to Sorted <br/> recorded on the recording medium, configured with the digital data reproduced during reproduction
The IEEE1394 interferon of said transmission time stamp added to each packet and the recording and reproducing apparatus for forming
Compare the count value of the operating clock of the
The reproduced digital data at the same timing.
Data from the recording / reproducing device via the transmission path
A recording / reproducing system characterized by transmitting to a decoding device .

As described in the description of the first means, the recording / reproducing apparatus often restores the timing on the receiving side without restoring the timing. However, when the buffer on the receiving side is small, recording is performed. It may be possible that the jitter increased by reproduction cannot be absorbed. Therefore, even at the time of reproduction, if the timing of transmission from the recording / reproducing apparatus to the transmission path is restored to some extent based on the transmission time stamp,
It is possible to avoid the situation where the above jitter cannot be absorbed.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1, 2 and 3.

(Embodiment 1) FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a recording / reproducing apparatus, 2 is a transmitting / receiving unit, 3 is a 1394 header deleting / adding means, 4 is CIP header deletion / addition, Pac
ket connection means, 5 is a recording / reproduction processing means, and 6 is a buffer. The operation of the recording / reproducing apparatus configured as described above will be described below.

In the recording / reproducing apparatus 1, the receiving means 2 first uses the 1394 header and the CIP from the received data packet.
By looking at the header, the packet to be received is selected and received. At this time, the channel number, the transmission destination of the data, the type of the data, etc. being transmitted can be identified using the header. 1394
The header deletion / addition unit 3, the CIP header deletion / addition, and packet concatenation unit 4 make the received packet 1394.
The source packet is restored by removing the header and CIP header. At this time, error processing is also performed at the same time.

Here, without removing the transmission time stamp,
192 bytes of each source packet are output to the recording / reproducing processing means 5 while being added. Recording / reproducing processing means 5
Performs a recording process on the received source packet and records it on a recording medium. At this time, since the recording / reproducing process is performed by converting to the existing digital VTR format, it is not necessary to distinguish between the existing digital VTR format and the MPEG recording, and the cost can be reduced. It is not necessary to generate a recording time stamp or add it to the source packet. Therefore, it is not necessary to analyze the contents of each transport packet or recover the 27 MHz clock using the PLL.

When the overflow / underflow problem may occur, a method such as generating 27 MHz from 274.5 MHz of the IEEE1394 interface clock by the clock conversion 7 at the time of recording and / or reproducing. Is also possible.

At the time of reproduction, the recording / reproduction processing means 5 performs processing such as demodulation and error correction, and then restores the source packet. Since the source packet already includes the transmission time stamp, it is not necessary to perform processing such as adding a transmission time stamp in the transmitting / receiving means 2 of the recording / reproducing apparatus.

As a result, the receiving device of the decoder which receives the transmission data from the recording / reproducing means can use the transmission time stamp from the original signal source to transmit the data at the same time interval as the data to the decoding means. It is possible to output the decoded image without the problems of overflow and underflow.

(Embodiment 2) FIG. 2 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 2, 1 is a recording / reproducing apparatus, 2 is a transmitting / receiving unit, 3 is a 1394 header deleting / adding means, 4 is CIP header deletion / addition, Pac
ket concatenating means, 5 recording / reproducing processing means, 6 buffer, 8 transmission time stamp adding / deleting means, and 9 data type determining means. The operation of the recording / reproducing apparatus configured as described above will be described below.

In the recording / reproducing apparatus 1, the receiving means 2 first uses the 1394 header and the CIP from the received data packet.
By looking at the header, the packet to be received is selected and received. At this time, the channel number, the transmission destination of the data, the type of the data, etc. being transmitted can be identified using the header.

1394 header deleting / adding means 3, CIP
The header deleting / adding and packet concatenating means 4 restores the source packet by removing the 1394 header and CIP header of the received packet. At this time, error processing is also performed at the same time. Here, the transmission time stamp is not removed, and 192 bytes of each source packet are output to the recording / reproduction processing means 5 while being added. The data type determination means 9 determines the type of data using the header and determines whether to delete the transmission time stamp.

When it is determined that the transmission time stamp is to be deleted, the transmission time stamp adding / deleting means 8 deletes the transmission time stamp and outputs it to the recording / reproducing processing means 5. When it is determined that the transmission time stamp is not deleted, the transmission time stamp is not deleted and the data is directly output to the recording / reproduction processing means 5. The data type determination means 9 also sends information to the recording / reproduction processing means 5 as to whether or not the transmission time stamp has been deleted.

Information on whether or not the transmission time stamp has been deleted is also recorded. Recording / reproducing processing means 5
Performs a recording process on the received source packet and records it on a recording medium. At this time, since the recording / reproducing process is performed by converting to the existing digital VTR format, it is not necessary to distinguish between the existing digital VTR format and the MPEG recording, and the cost can be reduced.

It is not necessary to generate a recording time stamp or add it to the source packet. Therefore, it is not necessary to analyze the contents of each transport packet or recover the 27 MHz clock using the PLL. If there is a possibility of overflow / underflow, the IEEE1394 interface clock 2
A method of generating 27 MHz from 4.576 MHz by the clock conversion 7 is also possible.

At the time of reproduction, the recording / reproduction processing means 5 performs processing such as demodulation and error correction, and then restores the source packet. Whether or not the transmission time stamp is added is determined based on the information indicating whether or not the transmission time stamp is deleted. If the source packet already includes the transmission time stamp, the transmission time stamp addition process in the transmission / reception unit 2 of the recording / reproducing apparatus is not necessary. If the source packet already contains the transmission time stamp, the transmission time stamp adding / deleting means 8 generates and adds the transmission time stamp based on the reproduced timing.

As a result, the receiving device of the decoder receiving the transmission data from the recording / reproducing means can transmit the data at the same time interval as the data to the decoding means by using the transmission time stamp from the original signal source. It is possible to output the decoded image without the problems of overflow and underflow. By using the present invention, it is possible to cope with both the case where it is not necessary to strictly restore the timing and the case where it is necessary.

(Embodiment 3) FIG. 3 is a block diagram of a recording / reproducing apparatus in an embodiment of the present invention. In FIG. 3, 1 is a recording / reproducing apparatus, 2 is a transmitting / receiving unit, 3 is a 1394 header deleting / adding means, 4 is CIP header deletion / addition, Pac
ket connection means, 5 is a recording / reproduction processing means, and 6 is a buffer. The operation of the recording / reproducing apparatus configured as described above will be described below.

In the recording / reproducing apparatus 1, the receiving means 2 first uses the 1394 header and the CIP from the received data packet.
By looking at the header, the packet to be received is selected and received. At this time, the channel number, the transmission destination of the data, the type of the data, etc. being transmitted can be identified using the header.

1394 header deleting / adding means 3, CIP
The header deleting / adding and packet concatenating means 4 restores the source packet by removing the 1394 header and CIP header of the received packet. At this time, error processing is also performed at the same time. Here, the transmission time stamp is not removed, and 192 bytes of each source packet are output to the recording / reproduction processing means 5 while being added. The recording / reproduction processing means 5 performs recording processing on the received source packet and records it on the recording medium. At this time, since the recording / reproducing process is performed by converting to the existing digital VTR format, it is not necessary to distinguish between the existing digital VTR format and the MPEG recording, and the cost can be reduced.

It is not necessary to generate a recording time stamp or add it to the source packet. Therefore, it is not necessary to analyze the contents of each transport packet or recover the 27 MHz clock using the PLL.

When the overflow / underflow problem may occur, a method such as generating 27 MHz from 274.5 MHz of the clock of the IEEE 1394 interface by the clock conversion 7 at the time of recording and / or reproducing may be used. It is possible.

At the time of reproduction, the recording / reproduction processing means 5 performs processing such as demodulation and error correction, and then restores the source packet. Since the source packet already includes the transmission time stamp, it is not necessary to perform processing such as adding a transmission time stamp in the transmitting / receiving means 2 of the recording / reproducing apparatus.

The timing extraction means 10 compares the transmission time stamp added to the restored source packet with the count value of the operation clock of the IEEE 1394 interface of the recording / reproducing apparatus, and from the buffer 6 to the transmission / reception means 2 at the coincident timing. Output to.

As a result, the time interval of each packet shifted due to recording and reproduction becomes the same as that before recording. As a result, even if the jitter on the receiving side cannot be absorbed due to a small buffer on the receiving side, the timing of transmission from the recording / reproducing apparatus to the transmission path should be restored to some extent based on the transmission time stamp. As a result, it is possible to avoid the situation where the above jitter cannot be absorbed. As a result, the receiving device of the decoder, which receives the transmission data from the recording / reproducing means, can use the transmission time stamp from the original signal source to transmit the data at the same time interval as the data to the decoding means, which may cause overflow or Decoding images can be displayed without the problem of underflow.

[0051]

As described above, according to the present invention, MPE
In G2 broadcast recording, the packet output timing at the time of reproduction can be restored by minimizing the additional circuit. In addition, it makes it possible to record the data in the MPEG2 transport stream format by utilizing the existing digital VTR format.

[Brief description of drawings]

FIG. 1 is a block diagram of a device configuration for realizing a storage / playback device according to a first embodiment.

FIG. 2 is a block diagram of a device configuration for realizing the storage / playback device according to the second embodiment.

FIG. 3 is a data layout diagram for explaining a storage / playback apparatus according to a third embodiment.

FIG. 4 is a block diagram of a device configuration for explaining processing of a signal source.

FIG. 5 is a schematic diagram of a source packet for explaining processing of a signal source and the like.

FIG. 6 is a block diagram of an apparatus configuration for explaining processing of a conventional recording / reproducing apparatus.

FIG. 7 is a block diagram of a device configuration for explaining the processing of the decoder.

[Explanation of symbols]

1 Recording / reproducing device 2 send and receive 3 1394 header deletion / addition means 4 CIP header deletion / addition, Packet connection means 5 Recording / playback processing means 6 buffers 8 Transmission time stamp addition / deletion means 9 Data type determination means

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Claims (6)

(57) [Claims] 1. A packet transmission timing and record re-recording.
It has a buffer that absorbs the difference in the timing of performing live data, and receives and records the digital data transmitted through the transmission path.
Recording / reproducing apparatus for recording on a recording medium, reproducing digital data recorded on the recording medium, and transmitting the digital data to the transmission path
And when to receive the packet and send it to the decoding section
It has a buffer that absorbs the timing difference,
Receives and decodes digital data sent from raw devices
A recording / reproducing system including a decoding device , wherein each packet constituting the digital data is transmitted from the signal source to a transmitting means connected to the transmission line when the packet is transmitted through the transmission line. is generated based on the timing outputted, the transmission time stamp is all packets <br/> or information added to a portion of the packet of each packet, the state of being added to the each packet Digi
Recording the total data on the recording medium in the recording / reproducing apparatus.
However, during playback, the recorded digital data is
Read from the recording medium, and set the transmission time stamp
Read from the recording medium in the state of being added to each packet
Without recovering the timing when reproducing digital data
To the transmission path, and the decoding device sends it to the transmission path.
It receives the received digital data and
Data transmission time stamp added to each packet that makes up the data
Each packet based on the
Which is one of the
A recording / reproducing system characterized by making a decision . 2. A packet transmission timing and recording re-recording
It has a buffer that absorbs the difference in the timing of performing live data, and receives and records the digital data transmitted through the transmission path.
Recording / reproducing apparatus for recording on a recording medium, reproducing digital data recorded on the recording medium, and transmitting the digital data to the transmission path
And when to receive the packet and send it to the decoding section
It has a buffer that absorbs the timing difference,
Receives and decodes digital data sent from raw devices
A recording and reproducing system comprising a decoding apparatus for determines the type of the digital data, the digital
When the data is MPEG2-TS, a transmission time stamp is added to each packet forming the digital data, and the digital data is MP.
Except for EG2-TS, the above digital data is configured
No transmission time stamp is added to each packet
State, and the recording and reproducing apparatus together with information for indicating whether or not adding the transmission time stamp
At the time of recording on the recording medium, and when reproducing,
In the information to indicate whether or not the im stamp is added
If the transmission time stamp is added,
The transmission time stamp is used as a new transmission time stamp.
And use it as is and add the transmission time stamp
If not, the transmission type is based on the regenerated timing.
Immediate stamp is generated and reproduced from the recording medium.
Each packet or part of a packet that makes up digital data
The transmission line from the recording / reproducing device.
A recording / reproducing system , wherein the recording / reproducing system transmits to the decoding device via the recording / reproducing device . 3. Timing of packet transmission and record re-recording
I have a buffer that absorbs the difference in the timing of
Recording / reproducing apparatus for receiving digital data transmitted through an EEE1394 transmission line , recording the same on a recording medium, reproducing the digital data recorded on the recording medium, and transmitting the digital data to the transmission line, and timing for receiving a packet And return
Has a buffer that absorbs the difference in the timing of transmission to the signal section.
The digital data transmitted from the recording / reproducing apparatus.
Recording / reproducing system comprising a decoding device for receiving and decoding
A beam, Di condition of adding a transmission time stamp to each packet
Digital data is recorded on the recording medium and is reproduced at the time of reproduction.
The said digital data constituting the said transmission time stamp and the recording and reproducing apparatus which is added to each packet
Of the operation clock of the IEEE 1394 interface
Timing when the count value is compared and the two match
In a recording and reproducing system, characterized by transmitting the reproduced digital data from the recording and reproducing apparatus to the decoding apparatus via the transmission path. 4. When the data type is MPEG2-TS and the transmission path is IEEE 1394 , the transpo
Claim, characterized in by adding a transmission time stamp of 4 bytes to record the Topaketto 1, 2 or 3 Neu
The recording / reproducing system described in some cases . At 5. The recording, recording and reproducing system according to claim 1, 2 or 3, characterized in that for generating an operation clock of the recording and reproducing apparatus from the IEEE1394 clock. 6. A reproduction, recording and reproducing system according to claim 1, 2 or 3, characterized in that for generating an operation clock of the recording and reproducing apparatus from the IEEE1394 clock.